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Louis was diagnosed with a torn ACL on the play that occurred at the beginning of the third quarter during the Bears' 28-10 win over the Minnesota Vikings. Antoine Winfield intercepted a pass thrown by Jay Cutler and during the return, Allen blindsided Louis causing his leg to twist under him.

Bears coach Lovie Smith didn't think it was a legal hit, and called the play one that the game could've gone without.

Officials didn't call a penalty on the play, but the NFL will review the hit and determine whether or not it deserves a fine, or other discipline. We should hear that ruling today at the earliest. For those looking to make your own ruling, here's Rule 12, Section 7 (b3) in the NFL rule book:

Prohibited contact against a player who is in a defenseless posture is: Illegally launching into a defenseless opponent. It is an illegal launch if a player (1) leaves both feet prior to contact to spring forward and upward into his opponent, and (2) uses any part of his helmet (including the top/crown and forehead/”hairline” parts) to initiate forcible contact against any part of his opponent’s body. Note: The provisions of (2) do not prohibit incidental contact by the mask or helmet in the course of a conventional tackle or block on an opponent.

The replay clearly shows Allen leaving his feet to make the block, so it will be interesting to see the NFL's ruling on the matter. For the Bears, they must replace Louis, and potentially left guard Chris Spencer, who also left Sunday's game with an injury.

Perhaps Chicago found an in-house blessing in disguise as former first-round pick Gabe Carimi, who was recently benched from his right tackle position in favor of Jonathan Scott, filled in nicely at guard when Louis went down.

"Maybe we're on to something. Maybe he's a guard. I don't know," Cutler said Monday on "The Jay Cutler Show" on ESPN 1000. "I know he's a guy who took the demotion really personally. He was hurt by it. He wants to be in there. He cares about his performance. He's hungry. Maybe him coming in at guard is going to be a blessing in disguise for him."

Though, just for good measure, the Chicago Bears made a move, signing former All-Pro Andre Gurode.

Even though Gurode, 33, has been to five Pro Bowls, and has started 127 NFL games at either guard or center, he joins the Bears as a backup.

Prior to the signing Tuesday of Gurode, undrafted rookie James Brown — who was inactive during Sunday's win over the Vikings — represented the only backup option remaining on the active roster. Brown still hasn't yet played in an NFL game.